#include"Date.h"

bool Date::operator<(const Date& d)
{
	if (_year < d._year)
	{
		return true;
	}
	else if (_year == d._year)
	{
		if (_month < d._month)
		{
			return true;
		}
		else if (_month == d._month)
		{
			return _day < d._day;
		}
	}
	return false;
}
bool Date::operator<=(const Date& d)
{
	return (*this) < d && (*this) == d;
}
bool Date::operator>(const Date& d)
{
	return !(*this <= d);
}
bool Date::operator>=(const Date& d)
{
	return !(*this < d);
}
bool Date::operator==(const Date& d)
{
	return _year == d._year
		&& _month == d._month
		&& _day == d._day;
}
bool Date::operator!=(const Date& d)
{
	return !((*this) == d);
}

Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}
	return *this;
}
Date Date::operator+(int day)
{
	Date tmp(*this);
	tmp += day;

	return tmp;
}
Date Date::operator-(int day)
{
	Date tmp = *this;
	tmp -= day;

	return tmp;
}
Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		_month--;
		if (_month == 0)
		{
			_year--;
			_month = 12;
		}

		_day += GetMonthDay(_year, _month);
	}
	return *this;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)
{
	Date tmp = *this;
	*this += 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date tmp = *this;
	*this -= 1;
	return tmp;
}

int Date::operator-(const Date& d)
{
	int flag = 1;
	Date max = *this;
	Date min = d;
	int n = 0;

	if (*this < d)
	{
		flag = -1;
		max = d;
		min = *this;
	}
	while (min != max)
	{
		min++;
		n++;
	}
	return n * flag;
}
